Power-hammer.



No. 743,763. PTENTED NGV. 10,1903 W. E. SHBEHY.

POWER HAMMER. APPLIoA'rIoN FILED Quiz. 1902.

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No. 743,763. PATENTED- Nov. 10,1903.

' W. B. SHBBHY.

POWER HAMMER.

APPLICATION' FILED DGT. 24. 1902.

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No. 743,763. PATBNTED Nov. 1o, 1903.

W. E. SHBEHY.

POWER HAMMER.

A AYPPLIOATION FILED 6051.24. 1902. l Ho MODEL. a smms-sn1zm a'.

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UNITED STATES Patented November 10, 1903'.

WILLIAM E. SHEEHY, OF BOSTON, MASSACHUSETTS.

POWER-HAM Nl ER.

SPECIFICATION' forming part of Letters Patent No. 743,763, dated November 10, 1903.

Application filed October 24, 1902. Serial No. 128,523. (No model.)

.To @ZZ zal/2,0m. V.it may concern:

Be it known that I, WILLIAM E. SHEEHY, a citizen of the United States, and a resident of Boston, county of Suffolk, State of Massachusetts, have invented an Improvement in Power-Hammers, of which the following description, in connection with the accompanying drawings, is a speeiiication, like numerals on the drawings representing like parts.

This invention relates to power-hammers; and its object is to provide a novel means for giving the hammer its reciprocations.

The improved hammer-actuating mechanism comprises a rotary actuating-pin, which operates in a recess in the hammer -block.

A Therecess is constructed to have a liftingwall and a depressing-wall, against which said crank-pin alternately engages thereby to raise and lower said block. The depressing-wall is so situated and of such shape with relationto the path of movement of the actuating-pin that the latter passes od from said wall during the downward movement of the hammer, whereby the actuating-pin gives the hammer-block its initial movement toward the anvil, but becomes disengaged from said block during the movement of the latter, so that the final movement of the hammer is effected by the actionof gravity and the momentum given to the hammer during its initial movement.

Referring to the drawings, Figure 1 is a side elevation of my improved hammer. Fig. 2 is a front view. Fig. 3 is a view of the back side of the hammer-block, showingdifferent positions of the actuator and correspending positions of the hammer block. Fig. 4. is a section through the anvil and lower part of the frame. Figs. 5 and 6 show the operation of the special type of anvil herein illustrated, and Fig. 7 shows a slightly-different way of mounting the anvil.

The frame supporting the operative parts may be constructed in any suitable way, and I have herein shownit as comprising the base 4, which is supported upon suitable foundations 5, and the head 6, supported by the stand or arm 7. The head has suitable ways therein, in which reciprocates the hammerblock 8, to which is secured in any approved way the hammer 9.

The actuating mechanism herein shown the downward movement of the hammer.

comprises a shaft 10, supported in the head 6 and carrying an actuating stud or pin 12, which is mounted eccentrically and which therefore has a revolving movement similar to that of acrank-pin. One convenient way of supporting this pin is by mounting the same in a disk 13, fast on the end of the shaft.

The hammer-block has at its rear side a recess in which said pin 12 operates. Said recess has the lifting-wall 14 and the depressing-wall 15, against which the pin 12 alternately impinges, the engagement of the pin with the lifting wall or shoulder 14 operating to lift the hammer-block and the engagement of said pin with the depressing wall or shoulderl 15 operating to give the hammerblock its initial downward movement.

The shoulder or wall l5 is so constructed that the actuator passes out of engagement therewith before it has reached its lowest point and during the downward movement of the hammer-block. -The result of this construction is that the actuator operates to give the hammer-block its initial movement. only in a downward direction, the remainder of the movement being effected by the momentum acquired-by the block during its initial movement and also by gravity. These walls or shoulders are preferably formed of some yielding material-such, for instance, as rawhide, leather, or similar material. In the preferred form of my invention the wall 14 is inclined, as shown in Fig. 3, and the twowalls 14. and 15 together have an approximately hook shape. This particular arrangement of walls, however, is not essential, as they might have other contours than that shown and come within my invention, provided the wall15 is so situated and of such shape that the pin passes o from it during As herein illustrated, the walls 14 and l5 are formed by a piece 17 of yielding material, such as rawhide or leather, which is doubled or folded over the pin 18 and which is received ina suitable recess in the inner face of the hammer-block. 19 and 20 designate suitable backing-blocks against which the member 17 rests and which hold it in shape. These backing-blocks are preferably of some suitable elastic material, such as rubber, for a purpose `hereinafter described.

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The operation of the actuator upon the hammer-block will be apparent from an inspection of Fig. 3,' in which three diierent positions of the parts are shown in full and dotted lines, respectively. The full-line position represents the actuator at the upper limit of its stroke and the ham mer-block Sin the same relative position. With the shaft rotating in the direction of the arrow, Fig. 2, the first quarter-revolution thereof will carry the aetuator down the inclined Wall or shoulder 14 until it is finally seated in the neck or curved portion of the member 17. At this point the 'actuator comes into engagement with the lower wall or shoulder 15, and further rotation ot' the shaft impinges said actuator against said Wall or shoulder and causes a downward movement of the hammer-block. During such downward movement the actuator by its engagement with the Wall or shoulder 15 operates to give the block 8 a positive movement toward the anvil,and consequently I refer to said wall as a depressing-wall.

When the actuator is in the dotted-line position a and the block is in the dotted-line position a', it will be observed that the said actuator is about to pass out of engagement with the depressing wall or shoulder 15, and during the movement of said actuator from dotted-line position ct to dotted-line position b the ham mer-block continues its downward movement by virtue of the momentum acquired during its initial movement and also by the action of gravity. When the hammerblockreaches its lowest position or dottedline position b', the actuator has reached the dotted-line position b and again comes in engagement with the lifting wall or'shoulder 14. Continued movement of the actuator by its impingementagainst thesaidlifting-shoulder 14 operates to raise the hammer-block into the full-line position, when the operation, as above described, may .be repeated. It will thus be seen that I have provided a device which operates to give the hammer-block a positiveinitial movement, butwhich becomes released from the said block during its movement, whereby the movement of the hammerblock during the latter part of the stroke is l entirely independent from the movement of the actuator and is effected solely by the momentum of the said block, assisted by the action of gravity.

By employing a yielding material, such as leather or rawhide, for the member 17 and backing thelatter withelastic backing-blocks the impingement of the actuator against the walls or shoulders 14 and 15 is cushioned, and the shoulders will yield somewhat to conform to the rotary movement of the actuator. In addition such particular construction of the shoulder 15 permit-s the actuator to give the said block a quickerimpulse, 'and also permits the point or end of the wall or shoulder to yield slightly to allow the actuator to snap out of engagement therewith.

I consider the method by which the motion is given to the hammer-block as very important, since at thetime that the hammer strikes the work it is entirely free from any of the actuating mechanism.

I have herein illustrated any suitable or usual mechanism for starting and stopping the rotation of the driving-shaft 10 at the appropriate times, the said mechanism consisting of a foot treadle or bail 3l, pivoted to the frame, as at 32, and having connected at one side thereof a rod 33, which in turn is connected to aspring-actuated plunger 34, operating in asuitable socket in the head 6. The plunger is connected to a lever 35, pivoted to said head and carrying at one end a roll 36,

adapted to engage the driving-belt 37 when the treadle 31 is depressed. A brake 36 is also connected to said llever in such 'a way that when the treadle is depressed the brake is raised from the brake-surface 37'; but when the. treadle is in raised position the brake is applied. With this construction to start the machine the treadle is depressed and the roll 37 brought into engagement with the belt, thereby to tighten the belt sufficiently to set the shaft 6 in rotation.

Obviously the speed of rotation of the shaft, and consequently the force given to the initial movement of the hammer-block,depends upon the degree to which the belt is tightened, a matter under the entire control of the operator. Y

As soon as the treadle 21 is released the spring 40 of the plunger operates to apply the brake and also allows the belt to slacken, whereby the machine will be stopped.

The anvil 3 is supported upon a stand or support 41, which is independent from the base of the stand for the hammer, and is supported upon foundations 42, independent from the foundations 5 for the base 4. As herein shown, the base 4 is provided with an opening or socket in which the stand'41 is received, and said stand is bolted to the foundation 42 by means of bolts 43. The upper end of the stand is provided with a dovetailed groove to receive a correspondingly-shaped rib/44 on the anvil 3. y

Theanvil herein illustrated is similar in many respects to that illustrated and claimed in my copending application, Serial No. 166,943, filed July 25, 1903, and is not, therefore, specifically claimed herein. It comprises a fixed portion 50, having a fixed Workreceiving face and a freely-rocking member 5l, which also has a work-receiving face. The freely-rocking member 51 sets in a recess in the anvil-die and is held in place in any suitable way, as by a pin 52, extending intoa slot 53 in the end of said rocking member.

The anvil is so positioned that the hammer is situated partially over the face of the fixed portion 50 and partially over the face of the rocking member 51. This construction of anvil is especially useful in forging tapered work, and in accomplishing this result the Work is first positioned on the fixed face of the anvil, as shown in Fig. 5, and roughed out. Thereafter it is placed upon the rocking member 51 and finished, said rocking member permitting the work to be given such a position that the hammer and anvil coperate to smooth and completelyinish it. The operation of this form of anvil is more fully set forth in my above-mentioned application, to which reference may be had.

In case it is desired to elevate the face of the anvil to operate on thinner work, I may interpose a block 56 between the anvil and its foundation or support 4l. In this case the block 56 has a dovetailed groove in which the dovetailed rib 44 of the anvil is received, and said block is in turn provided with a dovetailed rib which is received by the groove in the stand 41. y'

In order to enable the hammer-block to be readily removed, I form one of the ways in which said block slides in a removable gib 66, which is received in a groove in the head of the frame and which is ad justably held in place by the screw 67.

While in order to properly describe my invention it has been necessary to illustrate and describe in detail one embodiment thereof,I do not wish to be limited to the exact construction above set forth, as my invention is capable of embodiment in other constructions not herein illustrated.

Having described my invention, whatl I claim as new, and desire to secure by Letters Patent, is-

l. In a power-hammer, a reciprocating hammer-block having a recess provided with a lifting-wall and a depressing-wall, a rotary actuator having a crank-pin operating in said recess and adapted to engage said walls alternately therebyto raise and lower the block, the depressing-wall being so situated with relation to the path of movement of the crankpin that the latter passes 0E from the end of said wall during the downward movement of the block.

2. In a power-hammer, an anvil, a reciproeating hammer-block provided with a recess in one side having a hook-shaped Wall, a rotary actuator having a crank-pin to engage said wall and thereby raise and lower the hammerblock, the said wall being so situated with relation to the path of movement of the crank-pin that said pin passes off from the point of the hook during the downward movement of the block.

3. Ina power-hammer, an anvil, a reciprocating hammer-block provided with a recess having a downwardly and outwardly inclined wall which merges into a substantially horizontally and inwardly extending wall, and a rotary actuator having a crank-pin to engage said walls, the horizontally and inwardly eX- tending Wall having such relation to the path of movement of the crank-pin that the latter will pass off from said wall during the downward movement of the block.

4. In a power-hammer, an anvil, a reciproeating hammer-block provided with a recess in one side, having a hook-shaped resilient wall, and a rotary actuator having a crankpin to engage said wall and thereby raise and lower the hammer-block, said resilient wall having such relation to the path of movement of the crank-pin that the latter passes off from the end of the wall during the downward movement of the block.

5. In a power-hammer,a reciprocating hammer-block having a crank-pin-receiving recess and a rotary actuator having a crankpin operating in said recess, said pin by its engagement with one wall operating to raise the'hammer-block, and by its engagement with the other wall operating to depress said block, the latter wall being of such a length and so situated with relation to the path of vmovement of the crank-pin that the latter passes off from the end of said wall during the downward movement of the block.

6. In a power-hammer, an anvil, a reciprocating hammer-blockhaving a crank-pin-receiving recess provided with resilient walls, and an actuator having a crank-pin operating in said recess, said pin by its engagement with one wall operating to raise the hammerblock, and by its engagement with the other wall operating to depress said block, the latter wall being of such a length and so situated with relation to the path of movement of the crank-pin that the latter passes o from the end of said wall during the downward movement of the block.

7. In a power-hammer, an anvil, a reciproeating hammer-block having a substantially hook-shaped member of yieldable material secured to one side thereof, a backing for said member, and an actuator having a crank-pin to engage said hook-shaped member and give to the hammer-block its reciprocating movement. A i

8. In a power-hammer, an anvil, a reciproeating hammer-block having a substantially hook-shaped member of yieldable material secured to one side thereof, a resilient backing for the shank and point of said hook-shaped member, and an actuator having a crank-pin to engage said member.

9. In a power-hammer, an anvil, a reciprocating hammer-block having a substantially hook-shaped member of yieldable material secured to one side thereof, a backing for said member, and an actuator having a crank-pin to engage said hook-shaped member and give to the hammer-block its reciprocating movement, the point of said hook-shaped member being so situated that the crank-pin will pass off from the same during the downward movement of the block.

In testimony whereof I have signed my name to this specilieation lin the presence of two subscribing witnesses.

WILLIAM E. SHEEHY.

Witnesses:

WILLIAM J. FOLEY, WALLACE N. GREENWOOD.

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